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In this paper, a new Fe(II) complex, [FeCl 2 (BBP)]·(IPA) 2  (BBP = 1,3-bis(1H-benzimidazole-2-yl)propane, IPA = isopropanol), was synthesized and characterized by single crystal X-ray diffraction, elemental analysis, IR and UV/Vis spectroscopy. The crystal analysis showed that the Fe(II) complex is mononuclear, and its Fe(II) center is four coordinate in a slightly distorted tetrahedron. The electrocatalytic activity towards HER and the electrochemical sensing performance to H 2 O 2  of the Fe(II) complex was investigated by fabricating a composite electrode (a carbon paste electrode doped with the Fe(II) complex, Fe-CPE for short). Electrochemical studies have shown that the Fe-CPE only required a low overpotential of −0.481 V to drive the current density of 10 mA cm −2  with a smaller Tafel slope of 0.142 V dec −1  for HER in 0.5 M H 2 SO 4  at 298 K. Additionally, Fe-CPE serves as a H 2 O 2  sensor with superior electrocatalytic activity and a low detection limit of 0.36 μM (S/N = 3) in a linear range from 5.0 × 10 −7  to 4.0 × 10 −3  M in 0.5 M NaOH at −0.7 V. The above studies prove that the Fe(II) complex can be used as an effective bi-functional molecular electrocatalyst for HER and H 2 O 2  sensing.

A new iron(II) complex as bi-functional electrocatalyst for hydrogen evolution reaction and hydrogen peroxide sensing